United Technologies Carrier Transicold 69UG15, Operation And Service

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T-360 2–10
c. Water Temperature Gauge (see Figure 2.10 )
The function of this gauge is to observe water operating temperature. The gauge is connected to the
water temperature sensor.
d. Water Temperature Sensor (see Figure 2.6 )
This device senses engine water temperature and transmits a signal to the water temperature gauge.
e. Low Coolant Sensor (see Figure 2.6 )
This device senses the coolant level inside the radiator and will complete a conductive circuit as long as
the probes remain immersed in coolant. When coolant level falls below the probes, a signal is sent to the
auto restart module, shutting down the engine & all 12-volt circuitry.
f. Auto Restart Module (If So Equipped) see Figure 2.12 )
Auto start/restart is provided to simplify the start-up process and provide an automatic restart feature that
will automatically attempt to restart the unit in the event of shutdown. Four LEDs are used to indicate
shutdown from overcrank, overspeed, low oil pressure, and high water temperature. A fifth LED is used
to indicate the unit is running (see
Figure 2.12 ). Refer to Table 2–2 for system preset values.
The auto restart function will perform a series of six attempts to restart the unit and make three attempts
within each series. Once the function has completed all 18 attempts, the unit will automatically lock out
future crank attempts. Refer to
Table 2–2 for detailed information on auto restart sequencing.
2. Meters
a. Ammeter (A)
The ammeter (see Figure 2.10 ) is an indicator of the charging system and unit electrical draw. It indi-
cates the rate of discharge or charge of the battery. During start up, the intake heater draws approxi-
mately 42 amps.
b. Total Time Meter (TT)
The total time meter (see Figure 2.10 ) calculates the total hours and provides an accurate readout of
accumulated engine running time. This data can be used to establish proper maintenance schedules
(refer to Section 4.1).
3. Manual Switches
a. Intake Heater Switch (HS) (see Figure 2.10 )
The intake heater switch is a momentary switch. When held in the PREHEAT position, the switch allows
approximately 42 amps of battery current to flow into the intake heater, which preheats the air within the
intake manifold and allows the engine to start. After starting the engine, the intake heater switch should
continue to be held in the ON position for approximately 5 seconds until the engine has developed
enough oil pressure to close the oil pressure safety switch.
b. Ignition Switch (IGN) (see Figure 2.10 )
The ignition switch is a momentary switch that has OFF/ON/START positions. When held in the START
(ignition) position, it energizes the starter motor solenoid, which in turn allows the starter motor to crank
the engine. The switch is released to the RUN position once the engine has started.
c. Ignition Switch (IGN)(Auto Restart) (see Figure 2.10 )
The ignition switch is a maintained contact switch that has the RUN/OFF positions. When switched to the
RUN position, it energizes the control module, which in turn controls all functions of the Genset.
4. Timers
a. Intake Heater Timer (IHT) (If So Equipped)
The Intake Heater Timer continues to supply power to the intake heater for 3 minutes after initial start-up.
b. Starter Timer (SST)
The Starter Timer limits the amount of time that the starter can be engaged to 15 seconds. If the starter is
manually engaged for more than 15 seconds, power will be cut to the starter. Once power has been
removed, the starter can again be engaged for up to 15 seconds.